linux-kernel - Re: [PATCH v3 3/5] mm: madvise: implement lightweight guard page mechanism

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Message-Id: <20241023161205.003ad735d5f6ec50ec2eb054@linux-foundation.org>
Date: Wed, 23 Oct 2024 16:12:05 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>, "Liam R . Howlett"
 <Liam.Howlett@...cle.com>, Matthew Wilcox <willy@...radead.org>, Vlastimil
 Babka <vbabka@...e.cz>, "Paul E . McKenney" <paulmck@...nel.org>, Jann Horn
 <jannh@...gle.com>, David Hildenbrand <david@...hat.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, Muchun Song
 <muchun.song@...ux.dev>, Richard Henderson <richard.henderson@...aro.org>,
 Matt Turner <mattst88@...il.com>, Thomas Bogendoerfer
 <tsbogend@...ha.franken.de>, "James E . J . Bottomley"
 <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>,
 Chris Zankel <chris@...kel.net>, Max Filippov <jcmvbkbc@...il.com>, Arnd
 Bergmann <arnd@...nel.org>, linux-alpha@...r.kernel.org,
 linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
 linux-arch@...r.kernel.org, Shuah Khan <shuah@...nel.org>, Christian
 Brauner <brauner@...nel.org>, linux-kselftest@...r.kernel.org, Sidhartha
 Kumar <sidhartha.kumar@...cle.com>, Jeff Xu <jeffxu@...omium.org>,
 Christoph Hellwig <hch@...radead.org>, linux-api@...r.kernel.org, John
 Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v3 3/5] mm: madvise: implement lightweight guard page
 mechanism

On Wed, 23 Oct 2024 17:24:40 +0100 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:

> We permit this operation on anonymous memory only

What is the reason for this restriction?

(generally, it would be nice to include the proposed manpage update at
this time, so people can review it while the code change is fresh in
their minds)